Here are the major moments from ‘The Big Bang Theory’ series finale

One of the families on “The Big Bang Theory” is expanding ― even though the show no longer is.

The series finale of the long-running CBS sitcom aired Thursday night and was full of surprises.

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Among them was news that Leonard (played by Johnny Galecki) and Penny (Kaley Cuoco) are expecting their first child. It was a fitting milestone for the on-screen couple, considering many storylines have centered on their relationship over the years.

The first big reveal of the night, meanwhile, was that Sheldon (Jim Parsons) and Amy (Mayim Bialik) had won the Nobel Prize in physics. Their friends then accompanied them to Sweden so they could accept the honor.

Amy and Sheldon won the Nobel Prize for physics in Thursday's finale.

And in a particularly shocking development, the elevator in the friends’ longtime apartment building is finally fixed. The broken elevator had been a recurring gag throughout the series, as it required the characters to use the stairs anytime they arrived or departed the apartment.

“This is wild,” Sheldon says the first time he gets into the elevator after it was fixed.

The episode began with a touching video montage featuring some of the memorable moments in the show’s history, including the first time Leonard and Sheldon met Penny after she moved in across the hall from them.

Thursday’s finale ran for an hour and was split into two episodes: “The Change Constant” and “The Stockholm Syndrome.” The show aired for 12 seasons and 279 episodes, marking the most episodes of all time for a multi-camera show. The previous record was held by “Cheers,” which had 275 episodes.

The finale aired a little over two weeks after the cast commemorated the taping of their final episode on April 30 with a series of emotional posts to social media.

“As we get ready to tape our final episode tonight, to walk in and out of this apartment door for the last time, it is hard to find the words to articulate what a profound experience this has been,” Parsons captioned an Instagram post at the time. “But the words ‘love’ and ‘gratitude’ come to mind... so love and gratitude to all of you. ALL of you. Thank you.”